Even if going to buy on internet I wood first go to a dealer to handle one first. Some areas, like ours, have indoor ranges you can rent one to try before buying one. Good luck on your purchase whatever way you go.
I bought a gun on the internet and when it arrived at my LGS for the transfer my LGS had the same gun in the showcase. After all said and done I could have had the gun a week earlier for fifty cents more than the internet deal total cost was.
Lately I check prices on the internet and then call my LGS for his price. I end up buying the gun from LGS for basically the same as internet price without the waiting.
I have the SR40c and it is one of my favorite guns. I paid $405+tax several years aho and many places today still have the gun for that price. A friend has the 9c and I have shot it also. Personally I don't feel much difference between the 9 and the 40. The 9 is cheaper to shoot due to ammo costs. I will say during the ammo shortage I often found 40 caliber ammo on the shelves when 9 wasn't anywhere to be found.
A used gun *in good condition* is usually a solid bet. The only thing is, does the dealer have the price set low enough that it's a good enough deal. I've never bought a used rifle or handgun, but I've bought several shotguns used and only got burned once. That was my own dumb fault lol.
Under federal law – Handguns Long Guns (Rifles and Shotguns) Licensed firearms dealersDealers may not sell or deliver a handgun or ammunition for a handgun to any person the dealer has reasonable cause to believe is under age 21.8
Dealers may not sell or deliver a long gun, or ammunition for a long gun, to any person the dealer has reasonable cause to believe is under age 18.
9Unlicensed personsUnlicensed persons may not sell, deliver or otherwise transfer a handgun or handgun ammunition to any person the transferor has reasonable cause to believe is under age 18, with certain exceptions*.10
Unlicensed persons may sell, deliver, or otherwise transfer a long gun or long gun ammunition to a person of any age.
Still here, just drowning in school work and sadly haven't had time to fire the dang thing. But I must say after holding a variety of guns of different sizes and models this by far was the most comfortable and just seem to fit to my hand.